2145611280 has 80 divisors (see below), whose sum is σ = 6658413120. Its totient is φ = 571559424.

The previous prime is 2145611269. The next prime is 2145611333. The reversal of 2145611280 is 821165412.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 252379 + ... + 260741.

It is an arithmetic number, because the mean of its divisors is an integer number (83230164).

Almost surely, 2^2145611280 is an apocalyptic number.

2145611280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2145611280 is an abundant number, since it is smaller than the sum of its proper divisors (4512801840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2145611280 is a wasteful number, since it uses less digits than its factorization.

2145611280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9448 (or 9442 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 2145611280 is about 46320.7435173487. The cubic root of 2145611280 is about 1289.7840874141.

Adding to 2145611280 its reverse (821165412), we get a palindrome (2966776692).

The spelling of 2145611280 in words is "two billion, one hundred forty-five million, six hundred eleven thousand, two hundred eighty".